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Dataset
No. of queries
No. of documents
No. of query–document pairs
Language
537,366
5,480,860
7,736,480
Chinese
BM25 data . With the same query set as click data, we collected the first 200 documents for each query retrieved by SogouT-16 online search system ( Luo et al., 2017b ), a Solr http://lucene.apache.org/solr/ retrieval system using BM25 with default parameters (i.e., k1=1.2and b=0.75).
Evaluation data . We used the test data released in NTCIR-13 WWW task ( Luo et al., 2017a ), which is the most recent ad hoc search benchmark in

university that has a catalog available for 1917. The number of universities that have catalogs available increases to 13 in 1969. The number of faculty members is just 36 for all six programs in 1917. The number increases to 335 in 1940 and 2082 in 1969. Because the number of observations is small, the ratio of A to C is very volatile in this period.
Figure 1
Ratio of A to C, 1917–1969
There are some years before 1927 when the ratio of A to C is equal to zero for some programs. In some cases, there are no full professors who have surname initials A to C in

responses to each question varied. The two authors processed survey data, coded responses, and analyzed the data. Results are outlined in the next section.
4 Results
4.1 Respondents
4.1.1 Locations
The 241 respondents came from five continents and 29 countries. As shown in Figure 2 , 198 (82.2%) responses were from North America, 21 (8.7%) were from Europe, 13 (5.4%) were from Asia/Pacific/Middle East, five (2.1%) were from Africa, and four (1.7%) were from South America. Figure 3 shows the distributions of the respondents by country in the format of a pie

1 Introduction
This article is an extended version of my invited Luojia Lecture for Wuhan University on 30 th October 2018 with the same title as above. I use this opportunity to go deeper into some of the topics of the lecture by combining the perspectives and updating the results of four recent studies. One of them ( Sivertsen, 2016a ) presents the patterns of internationalization and discusses the criteria for research assessment in the social sciences and humanities (SSH). The second study ( Sivertsen, 2018a ) focuses on the use of language for internal